4.0 DIC, TAlk and anthropogenic CO2 distributions in the North Pacific 4.1 Distributions of DIC and TAlk The lowest concentrations of DIC and TAlk in
correlated with salinity. The general structure of the DIC and TAlk fields in the upper 1,000 m is similar to the density structure, suggesting that circulation plays a strong role in their distributions. The highest DIC concentrations are found in the intermediate waters and form a large maximum (2...
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| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.360.2086 http://www.pices.int/publications/scientific_reports/Report24/DIC.pdf |
| Summary: | correlated with salinity. The general structure of the DIC and TAlk fields in the upper 1,000 m is similar to the density structure, suggesting that circulation plays a strong role in their distributions. The highest DIC concentrations are found in the intermediate waters and form a large maximum (2325 – 2375 µmol kg-1) at approximately 1,800 – 2,200 m in the North Pacific (Fig. 4). In contrast, TAlk concentrations show a local minima in the Antarctic Intermediate Water (AAIW) to the south and in the North Pacific Intermediate Water (NPIW) to the north (Fig. 5). Below the NPIW, TAlk concentrations increase to a broad maximum at approximately 2,200 – 4,000 m (TAlk concentrations range from 2,400 – 2,460 µmol kg-1). The differences between the DIC and TAlk, particularly in intermediate waters, are caused by in-situ re-mineralization processes. The DIC maximum is shallower than the TAlk maximum because the total inorganic carbon is more strongly influenced by the shallow re-mineralization of soft tissue organic matter, whereas the total alkalinity is more strongly influenced by the dissolution of calcium |
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